Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . ::: ::::::::: w ::::::_t_:::: :—_:: :_: ::—::~::~_~::_ U 1111II 111 Mil II1111,11 ML. 1 T Tl hi H 300 400 500 600 Switchboard 700 800 900 Fig. 183. Curve of Steam Consumption of a Rateau Low-Pressure Turbine. Some tests quoted by Francis Hodgkinson on a Westinghouselow-pressure turbine made recently gave the following results: Steam Pressure,Lbs. per SquareInch Absolute,Dry and Satu-rated Steam. Vacuum in Exhaust,Inches Mercury Re-ferred to 30 InchBarometer. Load
Steam turbines; a practical and theoretical treatise for engineers and students, including a discussion of the gas turbine . ::: ::::::::: w ::::::_t_:::: :—_:: :_: ::—::~::~_~::_ U 1111II 111 Mil II1111,11 ML. 1 T Tl hi H 300 400 500 600 Switchboard 700 800 900 Fig. 183. Curve of Steam Consumption of a Rateau Low-Pressure Turbine. Some tests quoted by Francis Hodgkinson on a Westinghouselow-pressure turbine made recently gave the following results: Steam Pressure,Lbs. per SquareInch Absolute,Dry and Satu-rated Steam. Vacuum in Exhaust,Inches Mercury Re-ferred to 30 InchBarometer. Load inBrake Horse-power. Total Steamper Hour. Steam Con-sumptionBrake Horse-power Hour. 920 472 25,67017,487 7-7• 5-2 592321102 17,720 11,980 6,57o 8-7 586 458 16,40013,920 ° 4-5 234114 9,0366,248 54-8 332 THE STEAM TURBINE Fig. 184 is a copy of a shop drawing of a 1000-kilowatt Westing-house double-flow low-pressure turbine. The exhaust steam fromthe engines enters through the annular space H and is distributed. Fig. 184. iooo-kilowatt-Westinghouse Low-Pressure Turbine. to the right and left sections of Parsons blading. The upper halfof the drawing is a section of the rotor and shows the method ofconstruction. The exhaust is discharged through the base asindicated by arrows. The openings I, I are provided for con-venient inspection of the blading. They are covered with suitablecovers in which automatic relief valves are fitted. Economy curves of this turbine are shown in Fig. 185. Thepressure of the steam delivered to the turbine was approximatelyatmospheric. The vacuum, as shown by the curves, was 27\inches for one test and 28 inches for the other. Another Westinghouse turbine built to operate in connectionwith high-pressure reciprocating engines gave the followingresults in a shop test: Initial steam pressure, 15 pounds per square inch absolute. Superheat, 40 degrees F
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